COMPENSATION FOR OXYGENATED FUELS IN A DIESEL ENGINE
First Claim
1. A method to operate a diesel engine, comprising:
- determining a fuel compensation factor based on an amount of fuel being injected at a present level of engine output divided by an estimated amount of diesel fuel to provide the present level of engine output; and
estimating a fraction of oxygenate in fuel being supplied to the engine based on the fuel compensation factor.
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Accused Products
Abstract
A fuel compensation factor (FCF) is determined to account for the amount of oxygenated fuel blended in diesel fuel. In one embodiment, the FCF is based on an expected exhaust gas oxygen concentration compared to an actual exhaust gas oxygen concentration. The FCF is used to estimate an amount of oxygenated fuel in the blend. Such estimate can be used to adjust the exhaust temperature model, which is used at least in determining the temperature in aftertreatment devices, the fuel dilution model which affects oil change recommendations, and the diesel particulate filter loading model which affects regenerations. Biodiesels are more prone to waxing at lower temperatures. The estimated amount of biodiesel and the temperature in the injection system are used to prevent and/or delay starting when it is predicted that too much wax exists in the fuel system.
42 Citations
20 Claims
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1. A method to operate a diesel engine, comprising:
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determining a fuel compensation factor based on an amount of fuel being injected at a present level of engine output divided by an estimated amount of diesel fuel to provide the present level of engine output; and estimating a fraction of oxygenate in fuel being supplied to the engine based on the fuel compensation factor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An engine system, comprising:
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an exhaust gas sensor coupled to an engine exhaust; fuel injectors coupled to engine cylinders; and an ECU electronically coupled to the engine, the exhaust gas sensor, and fuel injectors, wherein the ECU determines a fuel compensation factor based on an expected exhaust gas sensor signal and an actual exhaust gas sensor signal and the ECU estimates a fraction of oxygenate in the fuel based on the fuel compensation factor. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A method to operate a diesel engine having an EGO sensor disposed in an engine exhaust, comprising:
estimating a fraction of oxygenate in fuel supplied to the engine based on an amount of fuel being injected at a present level of engine output divided by an estimated amount of diesel fuel to provide the present level of engine output. - View Dependent Claims (18, 19, 20)
Specification